-18767

Appears in sequences

• a(n) = Sum_{k=0..floor(n/7)} (-1)^k*binomial(n,7*k).at n=17A307041
• First term of n-th difference sequence of (floor(k*r)), r = sqrt(3/4), k >= 0.at n=17A325732
• First term of n-th difference sequence of round((k*Pi)), k >= 0.at n=17A325846